scholarly journals Assessing muscle compliance in stroke with the Myotonometer

2017 ◽  
Vol 50 ◽  
pp. 110-113 ◽  
Author(s):  
Xiaoyan Li ◽  
Henry Shin ◽  
Ya Zong ◽  
Sheng Li ◽  
Ping Zhou
Keyword(s):  
Muscle Compliance

Effects of immobilizing the cat peroneus longus muscle on the activity of its own spindles

1993 ◽  
Vol 75 (6) ◽  
pp. 2629-2635 ◽  
Author(s):  
M. Gioux ◽  
J. Petit
Keyword(s):  
Short Length ◽  
Full Extension ◽  
Peroneus Longus ◽  
Longus Muscle ◽  
Muscle Compliance ◽  
Muscle Spindle Endings ◽  
Static Discharge ◽  
Distal Tendon ◽  
Stimulation Of

The peroneus longus muscle of 10 cats were immobilized by fixating the distal tendon on the fibula at one of two length: neutral (length for a 90 degrees flexion of the ankle joint; 5 cats) or short (length for a full extension of the joint; 5 cats). Spindle afferent discharges were studied after 2 (4 cats) or 5 wk (6 cats) of immobilization and compared with those of four control animals. In each muscle, the discharges of nearly all primary and one of secondary muscle spindle endings were recorded during 2-mm ramp-and-hold stretches applied at different initial muscle lengths. A very slight increase in both the static discharge and the dynamic index of primary endings was observed in passive spindles. The increase in connective tissue that occurs in immobilized muscle and reduces muscle compliance was likely the sole alteration responsible for this constant effect. The responses to stretches of primary endings during stimulation of static and dynamic gamma-axons were not altered. Muscle immobilization at short length, even if spindle properties are not altered, can be expected to reduce the overall amount of group Ia afferent impulses with possible long-term changes on motoneuron properties.

Age-related changes in gallbladder contractility and cytoplasmic Ca2+ concentration in the guinea pig

1993 ◽  
Vol 264 (4) ◽  
pp. G624-G629 ◽  
Author(s):  
J. Ishizuka ◽  
M. Murakami ◽  
G. A. Nichols ◽  
C. W. Cooper ◽  
G. H. Greeley ◽  
...  
Keyword(s):  
Guinea Pig ◽  
Guinea Pigs ◽  
Contractile Force ◽  
Binding Ability ◽  
Age Related ◽  
Displacement Transducers ◽  
Force Displacement ◽  
Dose Dependent Increase ◽  
Muscle Compliance ◽  
Dose Dependent

Gallbladder (GB) motility diminishes with aging. This study was performed to characterize mechanisms that are involved in changes in GB contractility that occur during aging. Cytoplasmic Ca2+ concentrations ([Ca2+]i) and the contractile force of guinea pig GB muscle strips were simultaneously measured using fura-2 and force-displacement transducers. The binding ability of the Ca2+ channel antagonist and GB muscle compliance were also examined. The COOH-terminal octapeptide of cholecystokinin (CCK-8) evoked a dose-dependent increase in force and [Ca2+]i. Changes of [Ca2+]i and contractile force of muscle strips in response to CCK-8 were significantly greater in young (2 mo old) compared with mature and aged (12 and 24 mo old) guinea pigs (changes in [Ca2+]i, ED50: 46.1 nM at 2 mo, 6.1 microM at 12 mo, and 2.8 mM at 24 mo; changes of contractile force, ED50: 24.8 microM at 2 mo, 2.1 mM at 12 mo, and 357 mM at 24 mo). However, the magnitude of the contraction at each percent change in [Ca2+]i was actually similar in young and aged guinea pigs. In a Ca(2+)-free buffer, the responses of [Ca2+]i and force to CCK-8 in both young and aged GB muscles decreased, but those were still dose and age dependent. Binding ability of the Ca2+ channel antagonist did not differ in the young and aged groups, but the compliance of the GB muscle strip decreased with aging. These results suggest that both a reduced mobilization of intracellular Ca2+ and a decreased muscle compliance are responsible, at least in part, for age-related reduced contraction of guinea pig GB in response to CCK.

EFFECTS OF AN ANABOLIC STEROID ON FATIGUE AND COMPLIANCE OF DENERVATED GASTROCNEMIUS

1964 ◽  
Vol 46 (3) ◽  
pp. 331-335 ◽  
Author(s):  
F. Paleček ◽  
A. Boučková
Keyword(s):  
Anabolic Steroid ◽  
Muscle Weight ◽  
Denervated Muscles ◽  
Muscle Compliance ◽  
Tetanic Tension

ABSTRACT Maximal tetanic tension, fatigue after repeated tetani, and compliance were followed in vitro in normal and denervated rat gastrocnemii. Half the number of rats were pretreated with an anabolic steroid, 1α,17α-dimethylandrostan-17β-ol-3-one (DMA). The effects on muscle weight and maximal tetanic tension were insignificant in normal and in denervated muscles. In denervated muscles with DMA fatigue occurred more slowly than in muscles without DMA, and in the whole group of denervated muscles the fatigue was less than in the innervated controls. Differences were also observed in muscle compliance.

Factors Affecting Force Loss With Prolonged Stretching

2001 ◽  
Vol 26 (3) ◽  
pp. 262-272 ◽  
Author(s):  
David G. Behm ◽  
Duane C. Button ◽  
Jeremy C. Butt
Keyword(s):  
Maximal Voluntary Contraction ◽  
Muscle Activation ◽  
Maximum Voluntary Contraction ◽  
Voluntary Contraction ◽  
Control Group ◽  
Tetanic Force ◽  
Factors Affecting ◽  
Passive Stretching ◽  
Interpolated Twitch Technique ◽  
Muscle Compliance

The purpose of this study was to investigate factors underlying the force loss occurring after prolonged, static, passive stretching. Subjects were tested before and 5-10 min following 20 min of static, passive stretching of the quadriceps (N = 12) or a similar period of no stretch (control, N = 6). Measurements included isometric maximal voluntary contraction (MVC) force, surface integrated electromyographic (iEMG) activity of the quadriceps and hamstrings, evoked contractile properties (twitch and tetanic force), and quadriceps inactivation as measured by the interpolated twitch technique (ITT). Following stretching, there was a significant 12% decrement in MVC with no significant changes in the control group. Muscle inactivation as measured by the ITT and iEMG increased by 2.8% and 20.2%, respectively. While twitch forces significantly decreased 11.7%, there was no change in tetanic force post-stretch. Although possible increases in muscle compliance affected twitch force, a lack of tetanic force change would suggest that post-stretch force decrements are more affected by muscle inactivation than changes in muscle elasticity. Key Words: antagonist, electromyography, maximum voluntary contraction, muscle activation, twitch, tetanus

scholarly journals Muscle Compliance and the Longitudinal Transmission of Mechanical Impulses

1974 ◽  
Vol 64 (6) ◽  
pp. 623-642 ◽  
Author(s):  
Mark Schoenberg ◽  
Jay B. Wells ◽  
Richard J. Podolsky
Keyword(s):  
The Other ◽  
Transmission Time ◽  
Fiber Bundles ◽  
Measurement Time ◽  
Semitendinosus Muscle ◽  
Time Required ◽  
Muscle Compliance ◽  
Mechanical Impulse ◽  
Frog Sartorius ◽  
Transmission Velocity

The time required for a mechanical impulse to propagate from one end to the other was measured directly in frog sartorius muscles and in fiber bundles from the semitendinosus muscle. When the fibers were fully activated, the transmission velocity was 170 mm/ms. In resting fibers the transmission time was three to four times greater than in activated fibers. Control experiments indicated that the transmission time across the tendons was negligible. A muscle compliance of 55–80 Å per half sarcomere was estimated from these data. The "measurement time" of the method was calculated to be about 15 µs. This relatively short measurement time makes the method potentially useful for detecting changes in cross-bridge compliance.

Submental muscle tissue compliance during relaxation, contraction, and after tone-modification interventions

2010 ◽  
Vol 36 (1) ◽  
pp. 6-15
Author(s):  
Heather Clark ◽  
◽  
Nancy Soloman ◽  
Keyword(s):  
Muscle Tone ◽  
Therapeutic Interventions ◽  
Speech Motor Control ◽  
Therapeutic Effects ◽  
Tissue Compliance ◽  
Patient Groups ◽  
Muscle Groups ◽  
Muscle Compliance ◽  
Normal Speech ◽  
Speech Motor

Deviations in muscle tone are presumed to accompany speech motor control deficits in select forms of dysarthria, although there is little confirmation of these associations. For patients experiencing neuromuscular impairments, therapeutic interventions and/or principles have been devised to alleviate tone deviations where they occur and to prevent the development or exacerbation of tone deviations. Potentially therapeutic effects of these interventions on muscle tone in the speech musculature have not been studied empirically. One reason for the paucity of research is that tools for assessing muscle tone in the speech musculature are not generally available. This pilot study explored the feasibility of a commercially available, handheld instrument for measuring submental muscle compliance during relaxed and active conditions in 16 women with normal speech and swallowing. Additionally, the study examined changes in muscle compliance when interventions presumed to impact muscle tone were applied to the submental region. The Myotonometer™ was sensitive to changes in tissue compliance related to active contraction of the submental musculature. Applying ice or vibration to the submental region resulted in no systematic changes in submental tissue compliance in the relaxed or contracted state. Additional research is needed to validate the use of this instrument to reliably assess muscle tone and other contributors to tissue compliance. If successful, studies should examine the sensitivity of the Myotonometer™ to assess intervention-induced tissue compliance changes in patient groups with suspected muscle tone impairments. Further study of intervention effects across muscle groups and dosage levels can help inform clinical decisions about the potential usefulness of tone-altering interventions for the orofacial musculature.

scholarly journals Comparison of Interventional Strategies to Improve Recovery after Eccentric Exercise-Induced Muscle Fatigue

2021 ◽  
Vol 18 (2) ◽  
pp. 647
Author(s):  
Manuel García-Sillero ◽  
Javier Benítez-Porres ◽  
Jerónimo García-Romero ◽  
Diego A. Bonilla ◽  
Jorge L. Petro ◽  
...  
Keyword(s):  
Muscle Fatigue ◽  
Eccentric Exercise ◽  
Radial Displacement ◽  
Mechanical Vibration ◽  
Contraction Time ◽  
Positive Effects ◽  
Recovery Techniques ◽  
Effective Cost ◽  
Exercise Induced ◽  
Muscle Compliance

The aim of this study was to compare the effects of various recovery techniques on muscle tissue after eccentric exercise-induced muscle fatigue (EIMF). Forty subjects (24.3 ± 2.6 years; 77.45 ± 8.3 kg; 177.0 ± 6.4 cm; 24.66 ± 1.6 kg∙m−2) were randomly assigned to one of the following groups: manual therapy (n =10, MT), mechanical vibration (n = 10, MV), percussion therapy (n = 10, PT) or foam roller (n = 10, FR). The contraction time (Tc) and the radial displacement (Dm) of the gastrocnemius was evaluated through tensiomyography (TMG). The application of the different techniques had positive effects for Tc and Dm in the treated leg compared to the untreated leg (F = 50.01, p < 0.01, η2p = 0.58 and F = 27.58, p < 0.01, η2p = 0.43, respectively) and for the interaction of the factors (Time x Leg x Therapy: F = 5.76, p < 0.01, η2p = 0.32 and F = 5.93, p < 0.01, η2p = 0.33, respectively). The results of the various methods used were similar: Tc (F = 0.17, p = 0.917; η2p = 0.01) and Dm (F = 3.30, p = 0.031, η2p = 0.22). PT interventions show potential for restoring muscle compliance and reducing stiffness, similar to MT and possibly more effective (cost-time relationship) compared to MV or FR.

Construct validity of myotonometric measurements of muscle compliance as a measure of strength

2007 ◽  
Vol 28 (8) ◽  
pp. 913-924 ◽  
Author(s):  
Coral Gubler-Hanna ◽  
James Laskin ◽  
Benjamin J Marx ◽  
Charles T Leonard
Keyword(s):  
Construct Validity ◽  
Muscle Compliance

Immediate Effects of Dry Needling as a Novel Strategy for Hamstring Flexibility: A Single-Blinded Clinical Pilot Study

2020 ◽  
Vol 29 (2) ◽  
pp. 156-161 ◽  
Author(s):  
Noureddin Nakhostin Ansari ◽  
Parisa Alaei ◽  
Soofia Naghdi ◽  
Zahra Fakhari ◽  
Shiva Komesh ◽  
...  
Keyword(s):  
Pilot Study ◽  
Outcome Measures ◽  
Healthy Subjects ◽  
Peak Torque ◽  
Dry Needling ◽  
Serious Adverse Events ◽  
Beneficial Effects ◽  
Hamstring Flexibility ◽  
Novel Strategy ◽  
Muscle Compliance

Context: There are numerous studies on the benefits of dry needling (DN) for pain relief. No studies exist examining the effects of DN on hamstring flexibility. Objective: To determine the immediate effects of DN on hamstring flexibility in healthy subjects with shortened hamstrings. Design: A single-blinded, pretest–posttest clinical pilot study. Setting: A university physiotherapy clinic. Subjects: A total of 15 healthy subjects (female = 11; age = 23.26 [4.3] y) with shortened hamstrings participated in this study. Intervention: Subjects received a single session of DN. Three locations on the hamstring muscle group were needled, each for 1 minute. Main Outcome Measures: The active knee extension test, muscle compliance, passive peak torque, and stretch tolerance were measured at baseline, immediately, and 15 minutes after DN. Results: There were statistically significant improvements in all outcome measures immediately after DN and at the 15-minute follow-up. The effect sizes for all outcome measures were large (Cohen’s d ≥ 0.8). No serious adverse events were observed with DN. Conclusions: This is the first study that demonstrates the beneficial effects of DN on hamstring flexibility, muscle compliance, and stretch tolerance without added stretching. The beneficial effects of DN should encourage clinicians to use DN as a novel strategy for increasing muscle flexibility.

Sign in / Sign up

Export Citation Format

Share Document